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科技导报  2015 

松辽盆地双坨子气田天然气汞含量特征

DOI: 10.3981/j.issn.1000-7857.2015.18.006, PP. 40-44

Keywords: 松辽盆地,双坨子气田,长深气田,天然气,汞含量

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Abstract:

为探讨松辽盆地双坨子气田天然气汞含量分布特征及其成因,选取该气田7口气井作为研究对象,在对采集的天然气进行汞含量检测的同时,开展天然气组分和烷烃碳同位素分析。检测结果显示,双坨子气田天然气汞含量介于11~29200ng/m3之间,平均为17600ng/m3,属于中、低含汞天然气。双坨子气田天然气汞含量随产层深度的增加而增大,深层天然气要远高于中、浅层天然气,天然气汞含量的分布特征明显受该盆地双层地质结构的控制。研究表明,双坨子气田汞含量分布特征既与天然气类型有关,也与气源岩热演化程度有关。双坨子气田深层天然气为煤型气,中、浅层气则为油型气或油型气-煤型气的混合气。气源岩热演化程度的不同,是造成双坨子气田与其邻近的长深气田天然气汞含量差异较大的根本原因。

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